Means for making lath board



June 1 1926. 1,587,189

J. SCHUMACHER MEANS FOR MAKING .LAT H BOARD Filed May 5, 1924 3 Sheets-Sheet 1 I v INVENTOR.

A TTORNEYS June 1 1926. 1,587,189

J. SCHUMACHER MEANS FOR MAKING LATH BOARD 3/ f iled May 5, 1931 72.? Z52eets-Sheet 2 I INVENTOR.

By 6/7 5c/9amocber A -1 ITORNEYS June 1 1926.

1,587,189 J. SCHUMACHER MEANS FOR MAKING LATH BOARD Fi led Mjlgjigw 6 I5 Sheets-Sheet 5 4 INVENTOR. Job/7 Scb um acher By WhZkJ/M/ A TTORNEYS Patented June 1, 192 6. d

- UNITED STATES JOHN SCHUMACHER, LOS ANGELES, CALIFORNIA.

MEANS FOR MAKIlSI' G LATH BOARD.

Application filed May 5, 1924. Serial No. 711,289.

This invention relates to a method and means of making lath board WhlOh 1s adapted to receive a coating of plaster or the like, wherein recesses or pockets are I formed on theplaster receiving face of the board. More specifically, the product consists'of a cementitious body having a covering sheet of fibrous material adhering thereto. The covered face has pockets or recesses distributed thereover, the covering sheet being slit at each pocket marginal edge, and the -,cementitious body being indented to form the pockets. The primary object of this invention is to provide improved methods and means to operate upon the green plaster board made by continuously advanc= ing a covering sheet and supplying the plastic body thereto so as to form pockets therein. Another object of this invention is to provide a step in the process, and means to carryout said step wherein the pockets are formed by the impact of solid bodies upon the face of the board. Ina'ddition to the broader objects of this invention, there are certain details of design relating to the means employed to carry out the process.

With the above and other objects and corresponding accomplishments in-view, the invention consists. in the formation and construction of lath board by the embodiment of the invention shown in the accompanying drawing, and more particularly pointed out.

in the claims. In the. drawing: Fig. .1 is a. diagrammatic view showing the formation of plaster board by the continuousprocess and the production of plaster receiving pockets therein during the advance of the green board by means of hammers; Fig; 2- is a side elevation on an enlar ed scale showing one T1 nism for carrying is aside elevation showing another form of impact hammer; Fig,=4 is a plan view ,of the construction-shown in'Fig. 2; Figs. .5, 6, and 7 are sectional ent species of lath produced by my inven tion; Fi s. 5, 6, and 7 are face views of the boars corresponding to Figs. 5, 6, and 7 Fig. 8 is a diagrammatic view similar to Fig. 1 but' showing the impact mechanism drivendirectly by the travel of the paper; Fig. 9 is a side elevation of another impact mechanism; and Fig. '10 is a plan view of the structure shown in Fi 9.

Referring more particifiarly to Fig. 1, an

form ,of, impact .mec as out the invention; Fig. 3

views showing d1ffer..

endless conveyor is .indicated by 11. The

conveyor is passed over rollers 12 at the end tioned to supply a web 17 for the upper face of the lath. Web 17 is passed about rollers 18 and 19 as shown in Figs 1 wet plaster indicated by 20 being delivered to form the.

body of the lath 21 as indicated in Fig. 1.

The means and steps so far described are those employed by me in making plaster board. The green board in its wet state is advanced continuously from the roller 19,

being carried forward by the conveyor 11. It may be severed into suitable lengths and stacked and dried in the manner now well known in the art. However, before severing or removin from the conveyor, the, board is operate d upon to produce plaster receiving pockets.

To this end, I provide a frame 22 spanning the conveyor and having fixed therein a shaft 23. Pivotally mounted upon the shaft are hammer bearing members 24. These hammer bear'ngs have handles 25 extending forwardly nd preferably formed of leaves of spring metal. Secured to the ends of the handles 25 are hammer heads 26 for striking the upper face of the plaster board to form pockets. hammer bearing is a torsion spring 27, one end thereof being embedded in the shaft Secured to each and the other secured to the bearing.

Mounted in the frame below the heads 26 to form'an anvil and disposed under the upperbightof the. conveyor belt 11 is a roller 28; .Iournalled in suitable bearings on frame 22 is a shaft 29, and fixed thereto are tappets 30 arranged-to engage the hammerbearings 24tdraise the heads 26. Shaft 29" has a sprocket wheel 31 at the end thereof; over which is passed a sprocket chain 32.. ,Mounted upon a shaft'journalled below the lower bight of the conveyor belt is. a sprocket 33 geared to chain 32. A roller 34 fixed to the shaft is engaged by the conveyor belt and operated thereby. Thus, theshaft 29 is driven by the conveyor.v As a tappet 30 engages the free end of its corresponding hammer bearing, the hammer is raised against the action of its torsion of the handle.

spring 27. Continued revolution of a tapspring forces the hammer downwardly, the

bearing engaging a buffer bar extendin above the conveyor and transversely thereo The movement of the hammers are thus arrested, but the resiliency of the handles 25 permit further movement of the head 26, so that the latter strikes 1 and penetrates the upper surface of the green board producing a pocket therein. The rear of each head shown in Figs. 1 and 2 is bevelled, so that the head cuts a tongue from the surface sheet 17 and presses the tongue downwardly into the body of the plaster as best shown in Figs. 5 and 5 In Fig. 3 another form of hammer for carrying out my invention is disclosed. Secured to the hammer bearing 24 is an 'upright arm 36. Pivotally secured thereto is a handle 37 having an upright arm 38 corresponding to arm 36 to form a knuckle.

Fingers extend from the ends of arms 36 and 38 and are connected by a tension spring 39. A head 40 is secured to the ends The head shown is of diamond shape, but, if desired may be of the character shown in Fig. 2 or of any other desired shape. The hammer is operated as before, the-hammer bearing being arrested in its downward movement by the buffer bar 35, and continuing so as to strike and penetrate the board, tension spring 39 per" mitting the continuation of the movement.

With the type of head shown in Fig. 3, the

, shown therein.

. Referrin ockets will-be of the character shown in igs. 6 and 6 In this instance the upper covering-sheet 17 is severed around the entire marginal edge of each pocket, and

the portion severed is forced downwardly into the body of the plaster as shown in Fig. 6.

form and inclined to the length of the plaster board sheets are shown. These pockets may be staggered as shown therein. The depth of the pockets may be varied by adjusting the buffer bar 35, and the configuration of the pockets may be determined by the configuration of the hammer head being used. However, the particular form of pockets form no part of the present invention.

Referring more particularly to Figs. 8, 9, and 10, another species of mechanism for carrying out my invention is illustrated. more especially to Fig. 8, means for continuously producing plaster lath is This means is the same as that illustrated in Fig. 1 except that the tappet shaft 29 is driven by means of chains and sprocket gears from roller 18, the chains being indicated by 41. Thus, operation of the hammers is controlled by the travel of the green plaster board, whereas in the structure shown in Figs. 1 and 2, the operation of the hammers is controlled by the travelof the conveyor belt. It is sometimes found advantageous in the manufacture of plaster board and the like by the.

means shown in Figs. 1 and 8 to cause the conveyor to travel at a higher speed than the plaster board. This causes a slippage of the conveyor under the plaster board, resulting in stretching the board. In such a case it may be advantageous to drive the ham mers from devices geared in some manner to the plaster board or the elements constituting the same.

Referring to Figs. 9 and 10, a species of mechanism for producing a pocket in a board wherein two sets of hammers are employed is shown. The imperforate board is produced as before and travels along a eonveyor 11 over an anvil roller 28. Mounted in a frame 43 are shafts'44 and 44'. Fixed to the shaft 44 are hammers 45 arranged to engage a buffer bar 46. Fixed to shaft 44 is a crank arm 47 to which is pivotally secured a tappet rod 48 slidably extendin through aguide on frame 49. At the en of rod 48 is a roller 50. A tension spring 51 secures arm 47 to frame '49. A shaft 52 is journalled in the frame and fixed thereto a cam 53 having a high point 42 radially, in

line with the low point. Secured to the shaft arrow in Fig. 9 indicates the direction in r which the cam is rotating. Roller 50' will In Flgs. 7 and 7", pockets of rectangular ride to the high point and then drop suddenly to the low point, the tension spring '51 bringing the crank arm 47 and with it the board is formed continuously and then operated upon by impact to produce pockets. The result is a lath board, which in its final form has recesses or depressions arranged to receive intruding portions of a plaster coating. Variations in the product may be roduced by adding reinforcement to the ody, waterproofing the edges orsurfaces.

These features form no part of the present invention.

What I claim is:'

1. A machine for forming plaster lath or the like, comprising means for continuously advancing covering sheets and introducing a plastic body therebetween to form green board, an endless conveyor to receive the formed board, an anvil roller beneath the upper bight of said conveyor, and hammers positioned above said conveyor and anvil to strike said board so as to penetrate the same and express plastic material to form pockets.

2, A machine for forming plaster lath or the like comprising means for continuously advancing covering sheets and introducing a plastic body therebetween to form green board, hammers having resilient handles pivotally supported above the emerging board, tappets to engage said hammers, resilient means for causing said hammers to strike, and a buffer to arrest the movement of said handles.

3, A machine for forming plaster lath or the like, comprising means for continuously advancing covering sheets and introducing a plastic body therebetween to 'form green board, an endless conveyor to receive the formed board, an anvil disposed beneath the upper bight of said conveyor, hammers pivotally mounted above said conveyor with the heads thereof above said anvil, vsaid hammers having resilient handles, tappets to raise said'hammers for striking, resilient means to complete the. striking stroke so that said heads will penetrate the board and express plastic material to form pockets.

In witness that I claim the foregoing I striking have hereunto subscribed my name this 28th day of April, 1924.

' JOHN; SCHUMACHER. 

